fix: add useIsInPiPMode for ios

[santhoshvai]

💡 Overview

useIsInPiPMode only worked for Android. But with this change also works for iOS. Can be used for analytics in iOS.

📝 Implementation notes

Added an onPiPStateChange closure to StreamPictureInPictureController.swift, which is called when PiP starts or stops, enabling notification of PiP state changes from native code

[Copilot]

Pull Request Overview

This PR enables Picture-in-Picture (PiP) mode detection for iOS by extending the existing Android-only functionality to work cross-platform. The implementation adds native iOS event handling to notify React Native when PiP state changes.

Key changes:

• Added iOS-specific RxJS subject for PiP state tracking
• Modified the useIsInPiPMode hook to handle both Android and iOS platforms
• Implemented native iOS callback mechanism to communicate PiP state changes

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/react-native-sdk/src/utils/internal/rxSubjects.ts	Added iOS-specific RxJS subject for PiP state
packages/react-native-sdk/src/hooks/useIsInPiPMode.tsx	Updated hook to support both platforms with platform-specific logic
packages/react-native-sdk/src/components/Call/CallContent/RTCViewPipNative.tsx	Added PiP change event type and callback prop
packages/react-native-sdk/src/components/Call/CallContent/RTCViewPipIOS.tsx	Implemented PiP state change handler and RxJS integration
packages/react-native-sdk/src/components/Call/CallContent/CallContent.tsx	Added onPiPChange prop to public API
packages/react-native-sdk/ios/RTCViewPipManager.mm	Exported onPiPChange event property to React Native bridge
packages/react-native-sdk/ios/RTCViewPip.swift	Added event handling and callback setup for PiP state changes
packages/react-native-sdk/ios/PictureInPicture/StreamPictureInPictureController.swift	Added PiP state change callback mechanism

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